MDCAT 2026 MCQs

Use the Pythagorean theorem for perpendicular components.
Magnitude = √(3²+4²)=5.

The x-component is A cosθ.
10 cos60° = 10×0.5 = 5.

The y-component is A sinθ.
10 sin30° = 10×0.5 = 5.

Molarity equals moles divided by liters of solution.
0.50/2.0 = 0.25 M.

Vectors in the same direction add directly.
The resultant is 12+7 = 19 N.

Atomic number identifies the element.
In a neutral atom it also equals the number of electrons.

Opposite collinear vectors subtract in magnitude.
The resultant magnitude is |12-7| = 5 N.

Mass number applies to a specific isotope.
It is always a whole number.

Displacement is a vector from initial to final position.
It can be zero even when distance traveled is not zero.

Isotopes have the same atomic number but different mass numbers.
Their chemical behavior is usually similar.

Distance is a scalar and depends on the actual path.
It is always nonnegative.

Ions form by gaining or losing electrons.
Cations are positive and anions are negative.